Tangential Perforations Induce Cyclonic Fluid Separation
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Solution Overview
Problem
Conventional perforation methods in subterranean formations lead to turbulent fluid production, causing gas bubbles to be carried deep into the wellbore, resulting in inefficient liquid separation and requiring pumps to be placed far from perforations, which slows production and complicates fluid extraction.
Innovation Solution
A downhole tool is used to create tangential perforations in the subterranean formation, inducing cyclonic motion in fluids as they enter the wellbore, allowing for natural separation of gas and liquid phases, with perforating charges configured to fire in directions parallel or perpendicular to the tool's axis, promoting efficient fluid separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional perforation methods are used to create radial perforations, then fluid production is achieved, but turbulent fluid production causes gas bubbles to be carried deep into the wellbore, resulting in inefficient liquid separation
Solution Approach 1:
The patent applies asymmetry by changing the perforation pattern from conventional radial symmetry to asymmetric tangential orientations. The perforating charges are positioned and oriented to create non-radial perforation directions, which induce cyclonic motion in the fluid flow. This asymmetric configuration causes the fluid to rotate in a controlled manner, separating gas bubbles from the liquid phase before reaching the pump, thereby resolving the contradiction between achieving fluid production and maintaining efficient liquid separation.
Solution Approach 2:
The patent introduces a new dimensional aspect to the perforation geometry by transitioning from two-dimensional radial patterns to three-dimensional tangential orientations. The perforations are angled relative to the wellbore axis and oriented tangentially to the wellbore circumference, creating a third dimension of flow control. This dimensional change enables the induction of rotational motion (cyclonic flow) that facilitates gas-liquid separation, thereby improving liquid separation efficiency while maintaining productivity.
2Ease of operation
If pumps are placed far from perforations to avoid gas bubble interference, then liquid separation is improved, but production rates slow down and fluid extraction becomes more complex
Solution Approach 1:
The patent applies preliminary action by creating the cyclonic flow pattern and gas-liquid separation effect at the perforation point itself, before the fluid reaches the pump. The tangentially oriented perforations induce rotational motion that separates gas bubbles from liquid in advance, allowing the pump to be positioned closer to the perforations without gas bubble interference. This preliminary separation action eliminates the need to place pumps at great distances, thereby maintaining high production rates while achieving effective liquid separation.
3Reliability
If conventional radial perforations are used, then fluid communication with the formation is established, but close perforations interfere with the drain radius and create turbulent flow
Solution Approach 1:
The patent applies asymmetry by replacing conventional radial perforation patterns with asymmetric tangential orientations. The perforations are angled and directed tangentially to the wellbore circumference rather than radially outward, creating non-symmetric flow paths. This asymmetric configuration reduces interference between adjacent perforations and maintains more orderly flow patterns, thereby improving production efficiency while ensuring reliable fluid communication with the formation.
Solution Approach 2:
The patent introduces a new spatial dimension to the perforation geometry by orienting perforations tangentially to the wellbore circumference rather than radially. This three-dimensional angular orientation creates more effective flow paths that reduce mutual interference between perforations. The tangential arrangement in the circumferential dimension allows for closer spacing of perforations without compromising flow orderliness, thereby improving production efficiency while maintaining reliable fluid communication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tangential perforation method enhances fluid separation by creating a vortex that separates gas from liquid, allowing the liquid phase to be produced at the surface with minimal gas entrainment, thereby improving production rates and reducing the need for extensive pump placement.
Implementation Method 1
an explosive charge connected to the gun is detonated in order to penetrate or perforate one or more of the casing string, the wellbore, the formation, etc. A typical explosive charge may fire and result in a high-pressure, high-velocity jet that creates the perforation.
Implementation Method 2
The extremely high pressure and velocity of the jet cause materials, such as steel, cement, rock formations, etc. to flow plastically around the jet path, thereby forming the perforation.
Implementation Method 3
operating the downhole tool to form perforations in the subterranean formation in a manner that creates cyclonic motion in fluids that exit the subterranean formation and enter the wellbore through the perforations
Implementation Method 4
creating a vortex that separates gas from liquid
Data Source
AI summary
A method to separate a gas phase from a liquid phase in a subterranean formation that includes positioning a downhole tool in a wellbore, operating the downhole tool to form perforations in the subterranean formation in a manner that creates cyclonic motion in fluids that exit the subterranean formation and enter the wellbore through the perforations, the fluid having a gas phase and a liquid phase, and producing the liquid phase to the surface, whereby the liquid phase is substantially devoid of the gas phase as a result of the cyclonic motion.